Mixing truck is the most common special vehicle in construction site. Generally, the road condition is not good on construction site. Because the transportation medium of mixing truck is concrete and the weight is relatively large, the engine with high horsepower and sufficient power is preferred. When buying vehicles, we often hear about intercooled supercharged engine and turbocharged engine.

中冷增压就是当涡轮增压器将新鲜空气压缩经中段冷却器冷却，然后经进气管、进气门流至汽缸燃烧室。有效的中冷技术可使增压温度下降到50摄氏度以下，有助于减少废气的排放和提高燃油的经济性。

Intercooling supercharging is when the turbocharger compresses the fresh air, cools it through the middle cooler, and then flows to the cylinder combustion chamber through the air inlet pipe and intake valve. Effective intercooling technology can reduce the supercharging temperature to below 50 ℃, which helps to reduce exhaust emissions and improve fuel economy.

中冷增压实际上是一种空气压缩机，通过压缩空气来增加进气量，它是利用发动机排出的废气惯性冲力来推动涡轮室内的涡轮，涡轮又带动同轴的叶轮，叶轮压送空气滤清器送来的空气，使之增压进入气缸。当发动机转速增快，废气排出速度与涡轮转速也同步增快，叶轮就压缩更多的空气进入气缸，空气的压力和密度增大可以燃烧更多的燃料，相应增加燃料和调整一下发动机的转速，就可以增加发动机的输出功率。

Intercooling supercharging is actually a kind of air compressor, which increases the air intake by compressing the air. It uses the inertia impulse of the exhaust gas from the engine to drive the turbine in the turbine chamber. The turbine drives the coaxial impeller, which presses the air sent by the air filter to increase the pressure into the cylinder. When the engine speed increases, the exhaust gas discharge speed and the turbine speed also increase synchronously, the impeller will compress more air into the cylinder, and the increase of air pressure and density can burn more fuel. Correspondingly, increasing the fuel and adjusting the engine speed can increase the output power of the engine.

中冷增压系统平时是不工作的，只有当车辆满载或者达到一定的速度时，中冷增压可以是柴油机在排量不变，重量增加不大的情况下达到增加输出功率的目的，与相同功率的非增压柴油机相比，增压柴油机不仅体积小，重量轻，功率大，而且还降低了单位功率的成本，因此，增压技术不仅广泛应用在柴油机上，现在很多燃油为汽油的车辆也在使用中冷增压系统，它是改善内燃发动机的重要技术手段。

The intercooled supercharging system usually does not work. Only when the vehicle is fully loaded or reaches a certain speed, the intercooled supercharging can increase the output power of the diesel engine with the same displacement and little weight increase. Compared with the non supercharged diesel engine with the same power, the supercharged diesel engine not only has small volume, light weight, high power, but also reduces the unit power Therefore, supercharging technology is not only widely used in diesel engines, but also used in many gasoline fueled vehicles. It is an important technical means to improve the internal combustion engine.